1. On n8n's main dashboard, head over to the 'Credentials' tab to get started.
2. After that, click the 'Create Credential' button in the top-right corner.
3. Browse the list of apps, then select 'WhatsApp OAuth API' from the list of options.
4. Subsequently, click 'Continue' to proceed.
5. Type the 'Client ID' of your WhatsApp account into the provided input field. If you can't find it from your Meta for Developers dashboard, look for App ID instead.
6. After that, provide the 'Client Secret' and type it into the next input field. Similar to Client ID, the latter is called App Secret on Meta for Developers.
7. Once done, click 'Save' to apply the changes.
8. Finally, your WhatsApp OAuth account will be connected to n8n.